At first I thought that in order to do an ad-hoc deployment of a beta iPhone app, you had to burn the device's UUID of the target user into the app. (I use TestFlight to do it)
But a few days ago I came across http://retraceapp.com/, and you're able to download their app straight from their website.
I did get several security warnings, but I didn't think this was possible at all. Does someone know how they did this?
Update: The link is no longer available on the website.